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New Accounting Pronouncements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2019 | Dec. 31, 2018 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained deficit | $ 742.3 |  |  | $ 650.1 | $ 738.3
Accounting Standards Update 2016-01 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of adoption of ASU Adoption |  |  |  |  | 12.0
Accounting Standards Update 2016-15 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Proceeds (expenditures) related to company-owned life insurance policies, net | 0.7 | $ 7.7 |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Impact of adoption of ASU Adoption |  |  |  |  | (0.2)
Retained deficit |  |  |  |  | 0.2
Accounting Standards Update 2017-07 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net periodic benefit income (expense) | $ 5.1 | $ 15.0 |  |  |
Accounting Standards Update 2018-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Retained deficit |  |  |  |  | $ 4.8
Subsequent Event | Scenario, Forecast | Accounting Standards Update 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Net lease assets |  |  | $ 35.0 |  |
Net lease liability |  |  | $ 35.0 |  |

X
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